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High resolution spectroscopy of directly imaged exoplanets with KPIC

Wang, Jason J. and Delorme, Jacques-Robert and Ruffio, Jean-Baptiste and Morris, Evan and Jovanovic, Nemanja and Echeverri, Daniel and Schofield, Tobias and Pezzato, Jacklyn and Skemer, Andrew and Mawet, Dimitri (2021) High resolution spectroscopy of directly imaged exoplanets with KPIC. In: Techniques and Instrumentation for Detection of Exoplanets X. Proceedings of SPIE. No.11823. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 1182302.

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The Keck Planet Imager and Characterizer (KPIC) is a novel instrument that combines high-contrast imaging with high-resolution spectroscopy to enable high-dispersion coronagraphy (HDC) techniques that allow us to characterize directly imaged exoplanets at a spectral resolution of R~35,000. At this resolution, individual absorption lines in planetary atmospheres are spectrally resolved, allowing for measurements of molecular abundances to constrain chemical composition, planetary radial velocities to constrain orbital configurations, and planetary spin to constrain angular momentum evolution. I will provide an overview of the instrument, with a focus on its novel fiber injection unit (FIU) and the use of single mode fibers. I will discuss new HDC techniques we are developing that take advantage of the single-mode fibers of KPIC to both spatially and spectrally filter out the bright glare of the host stars to study the faint exoplanets. In particular, we have demonstrated the ability to forward model the high-resolution spectrum of diffracted stellar speckles, allowing us to directly fit our data without the need for cross-correlation functions. I will present some early science observations from KPIC that successfully demonstrate its technical capabilities, with the highlight being the first detection of all four HR 8799 planets at high spectral resolution. I will conclude with future avenues to push the sensitivity of HDC techniques and discuss possible synergies with other exoplanet characterization techniques such as long-baseline interferometry.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wang, Jason J.0000-0003-0774-6502
Delorme, Jacques-Robert0000-0001-8953-1008
Ruffio, Jean-Baptiste0000-0003-2233-4821
Jovanovic, Nemanja0000-0001-5213-6207
Echeverri, Daniel0000-0002-1583-2040
Skemer, Andrew0000-0001-6098-3924
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE). J.J.W. is supported by the Heising-Simons Foundation 51 Pegasi b Fellowship. This work was supported by the Heising-Simons Foundation through grants #2015-129, #2017-318 and #2019-1312. This work was supported by the Simons Foundation. We thank the Keck staff for helping support the deployment of KPIC during the global pandemic. Data presented in this work were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. We wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Astronomy Department
Funding AgencyGrant Number
Heising-Simons Foundation51 Pegasi b Fellowship
Heising-Simons Foundation2015-129
Heising-Simons Foundation2017-318
Heising-Simons Foundation2019-1312
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Exoplanets, high contrast imaging, high resolution spectroscopy, high dispersion coronagraphy, single mode fibers, Keck Planet Imager and Characterizer
Series Name:Proceedings of SPIE
Issue or Number:11823
Record Number:CaltechAUTHORS:20220610-133625200
Persistent URL:
Official Citation:Jason J. Wang, Jacques-Robert Delorme, Jean-Baptiste Ruffio, Evan Morris, Nemanja Jovanovic, Daniel Echeverri, Tobias Schofield, Jacklyn Pezzato, Andy Skemer, and Dimitri Mawet "High resolution spectroscopy of directly imaged exoplanets with KPIC", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 1182302 (1 September 2021);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115119
Deposited By: Tony Diaz
Deposited On:11 Jun 2022 00:27
Last Modified:13 Jun 2022 17:12

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